Fix Pack 3 - Archive Policy

I have just applied 6.5.4 Fix Pack 3 to our mail servers and we utilise enforced archiving via policies.

Now documents that are marked to expire in users mail files are not being moved to their archive after running a compact -A. However it will work on my mail file which makes me assume it is some sort of rights issue. Has anyone experienced this and if so is there a fix or do I need to roll back asap?

Subject: Fix Pack 3 - Archive Policy

I have since found that I think the reason behind this is that our users are using 6.5.1 clients and our mail servers are now 6.5.4fp3. Any takers?